Process for the production of colored discharge effects



Patented June 21, 1932 UNITED STATES PA EN OFFICE HEINRICH WERDENBIBG, OI NEU-ALLSCHWIL, N EAR BASE-L, SWITZERLAND, ASSIGNOR TO FIRM DUBAND & HUGUENIN S. A.., OI' IBASEL, SWITZERLAND PROCESS FOR THE PRODUCTION OF COLDBED DISCHARGE EFFECTS I No Drawing. Application filed December 16, 1930, Serial No. 502,864, and in Germany December 27, 1929.

Many dyestuffs which are usedin hydrosulphite discharge printing for colored efi'ects show the drawback that after'steam .ing their original dyetone only comes back being absolutely fast to hydrosulphite and its being partially destroyed.

With a view to completely develop a dyestuff which is not completely developed, i. e. to oxide any available leuco compound on the fibre, it is often suggested to submit the material, after the steaming, to an aftertreatment in an oxidizing bath containing bichromate of soda or hydrogen peroxide,

. etc.

Such an aftertreatment is not sufficient in every case and is not applicable to all fibres. Many tones suffer for instancefroln a treat- .ment with bichromate. Such a treatment is also complicated and costly.

It has now been found that deep effects can be obtained in the direct way by adding to the discharge color a suitable oxidizing agent, such as for instance chlorate (chlorate 80 of soda, chlorate of potash etc.)

It is surprising that a reducing agent like hydrosulphite and an oxidizing agent like chlorate, which are both contained in the printing color at the same time, have no disturbing effect on each other.

' The presence of chlorate in the printing paste does not adversely affect the stability of the same. The discharge effect of the ground color is normal and the colored discharges obtained are deeper than those obtained without chlorate.

The present process isapplicable-to the most difierent textile fibers. It is explained by the following examples (A) Gotten The -following.printing colors are pre- 50. pared:

Parts (1) Chromorhodine BR (Colour Index No. ,762) 20 Hot water 180 Gum dragon thickening.. 600 -Heaitdup to dissolve, let cool down and u Sodium sulphoxylate formaldehyde 100 Chromium acetate.32 Tw -2 4 Sodium chlorate solution 1: 3 40 7 Parts (22, Thiopyromne (Colour Index No.

739 20 Monoethylglycol 50 Hot water 170 Arabic gum'lzl 500 Heat up to dissolve, let cool down and add: g Sodium sulphoxylate formaldehyde 100 Tannin and water 1: 1 120 Sodium chlorate solution 1:3 40 76 Parts (3) Rhodamine B extra (Colour Index No. 749) 20 Monoethylglycol 50 80 Hot water 17 0 Arabic gum 1:1 500 Heaiodup to dissolve, let cool down and a Sodium sulphoxylateformaldehyde Tannin and water 1: 1 Sodium chlorate solution 1: 3 40 Cotton which is dyed with a dischargeable dyestuff, is printed with one of these discharge colors, dried, aged for 5 minutes in the rapid ager, and afterwards steamed for 40 minutes.

In the case of Example1,there is washed straight away, whereas in the case of Examples 2 and 3 a treatment in a tartar emetic bath takes place before washing. In all three 100 cases brighter and deeper discharge effects are obtained than with discharge colors which do not contain any chlorate of soda.

The following printing pastes are prepared:

Heat up to dissolve, let cool down and add:

Sodium sulphoxylate formaldehyde 200 Sodium chlorate solution 1: 3 40 Parts (5) Fast acid violet A2R (Colour Index No. 758) 20 Hot water 90 British gum 1:1 650 Heat up to dissolve, let cool down and add:

Sodium sulphoxylate formaldehyde 200 Sodium chlorate solution 1: 3 40 Parts (6) Eosine (blue shade) No.55 (Colour Index No. 778) 20 Hot water 90 British gum 1: 1 650 Heat up to dissolve, let cool down and add:

Sodium sulphoxylate formaldede 200 Sodium chlorate solution 1: 3 40 (0) Silk The following printing colors are made up no Parts (7) Thiopyronme (Colour Index No.

739 20 Monoethylglycol 50 Hot water 140 G5 Arabic gum 1: 1 600 aacaoov Heat up to dissolve, let cool down and add:

Sodium sulphoxylate formaldehyde containing zinc oxide 150 Sodium chlorate solution 1: 3 10 7 Parts (8) Rhodamine B extra (Colour Index No. 749) 20 Monoethylglycol 50 Hot water Arabic m 1: 1 600 Headtdup to issolve, let cool down and Sodium sulphoxylate formaldehyde containing zinc oxide---" Sodium chlorate solution 1: 3 40 Parts (9) Acridine red brown (German Patent No. 495,115) 20 Monoethylglycol 50 Hot water 140 Arabic gum 1: 1 600 Heat up (to dissolve, let cool down and a (1: Sodium sulphoxylate formaldehyde containing zinc oxide 150 Sodium chlorate solution 1: 3 40 Parts (10) Thionine blue GO (Colour Index No. 926) 20 Hot water Arabic gum 1: 1 600 Heat up (tloi dissolve, let cool down and a Sodium su1phoxylate formaldeh de containing zinc oxide 150 So 'um chlorate solution 1: 3 40 Parts (11) Eosine (blue shade) No. 55

(Colour Index No. 77 8 20 Hot water 190 Arabic gum 1: 1 600 Heat up 33 dissolve, let cool down and a Sodium sulphoxylate formaldehyde containing zinc oxide 150 Sodium chlorate solution 1: 3 40 (D) Acetate 85270 The following printing paste is prepai ed z El 5 (l2) Thio yronine (Colour Index No. 5

Monoethylglycol 50 Hot water 90 Arabic um 1: 1 600 Heat up to 'ssolve, let cool down and to add- Sodium sulphoxylate formaldehyde containing basic zinc oxide- 150 Sodium chlorate solution 1: 3 80 Acetate silk which has previously been dyed with a dischargeable dyestuif is rinted with the above discharge color, rie aged for 5 minutes in the rapld ager, and steamed afterwards for 40 minutes, then washed. One obtains a considerably deeper shade than when using a discharge color which does not contain any chlorate of soda.

What I claim is 1. A process for obtaining color discharge eflects according to theppnnci le of reduction, consisting in adding to t e usual discharge printin color with the view of obtaining color ischarge efi'ects of increased -intens1ty together with the reducing agent a chlorate as oxidizing agent.

2. A process for obtainm color discharge efiects according to the principle of reduction, consisting in adding to the usual'discharge printing color with the View of obtaining colored discharge effects of increased intensity together with the reducing agent sodium chlorate as oxidizing agent.

In witness whereof I have hereunto signed 40 my name this 6th day of December, 1930.

HEINRICH WERDENBERG. 

